tcpdump snippets
List interfaces GUI Capture file rotation stftime codes ...
Post tagged: idea
Documenting Architecture Decisions
Context Approach Format Conclusion ...
Python development tips 2024
Local install packages Better debugging Built-in exceptions Adding site specific customizations Constants ...
File system encryption in Alpine Linux
This is similar to my previous article Encrypting Filesystem in Void Linux but for Alpine Linux The point of this recipe is to create a encrypted file sytem so that when the disc is disposed, it does not need to be securely erased. This is particularly important for SSD devices ...
Desktop Environments 2023
Around April 2023, I decided to look for a new Linux Desktop Environment for my personal void linux. So I tried these distros: lxqt: This is the one I eventually chose to switch to. I liked it that it was very small and light, and very modular, almost like a kit that you assemble yourself. Because I have thinking for some time that I would like to make my ...
Personal thoughts on GUI programming
I have been programming for about 40 years. Going through a lot of different languages and programming paradims. Lately most of my programming is done in: bash/shell script Python ...
Raspberry Pi emulation with Qemu
The idea here is that we use a Desktop PC for developing/debugging Raspberry Pi set-ups using qemu for emulating Rasperrby Pi. qemu currently supports the following configurations: Raspberry Pi Zero and 1A+ (armhf) Raspberry Pi 2B (armv7) ...
Moving to Home Assistant
I am busy moving away from my VeraEdge installation to a Home Assistant running on a Raspberry Pi 4. This is because it looks like the maker of the VeraEdge was bought and it is slowly being phased out. For this I am using the following parts: ...
nas ops cmd
This is my op script. This is stupidly simple script to elevate priviledges in order to manage NFS shares on my QNAP NAS. The idea is that NFS shares do squash-root so admin access is disallowed through NFS. This gives a convenient way to issue root level commands without using NFS but instead use ssh ...
My tale of IPv6 blues
My ISP provider is KPN. They recently enabled IPv6 in my street. I was using before a IPv6 Tunnel Broker, starting with SixXS and after they went out, with Hurricane Electric. So naturally, I decided to switch to KPN's native IPv6 service. They provide a /64 prefix, which is reasonable. Would be better ...
Encrypting FileSystem in Void Linux
The point of this recipe is to create a encrypted file sytem so that when the disc is disposed, it does not need to be securely erased. This is particularly important for SSD devices since because of block remapping (for wear levelling) data can't be overwritten consistently. The idea is that the boot/root filesystem containing the encryption ...
manage busyness
Former United States President Dwight Eisenhower was responsible for putting together one of the most important yet fundamentally simple to understand concepts in time management. Eisenhower's Urgent/Important Principle is a tool to help decipher what tasks need to be addressed more immediately than others. Anyone who uses the principle will be better able to organize and orchestrate their ...
Writing Safe Shell scripts
Writing shell scripts leaves a lot of room to make mistakes, in ways that will cause your scripts to break on certain input, or (if some input is untrusted) open up security vulnerabilities. Here are some tips on how to make your shell scripts safer. Don't The simplest step is to avoid using shell at all. Many higher-level languages are both easier to write the code in in the first place, and avoid some of the issues that shell ...
organizing notes
My Documents DOCUMENTS Project Folder old ...
RPMGOT
Software package download proxy rpmgot is a simple/lightweight software package download proxy. It was designed to run on an OpenWRT router with some USB storage. So it is fully implemented as an ash script. The basic idea has been implemented multiple times. For example refer to this article on a squid based implementation. Unlike squid, which once you include all its dependencies can use up over 1MB of space just to install it, this software has very few dependencies. The idea is for small developers running the same operating system version(s) would benefit from a local mirror of them, but they don't have so many systems that it's actually reasonable for them to run a full mirror, which would entail rsyncing a bunch of content daily, much of which may be packages would never be used. rpmgot implements a lazy mirror something that would appear to its client systems as a full mirror, but would act more as a proxy. When a client installed a particular version of a particular package for the first time, it would go fetch them from a "real" mirror, and then cache it for a long time. Subsequent requests for the same package from the "mirror" would be served from cache. ...
Resizing a Linux RAID
It is possible to migrate the whole array to larger drives (e.g. 250 GB to 1 TB) by replacing one by one. In the end the number of devices will be the same, the data will remain intact, and you will have more space available to you. Extending an existing RAID array In order to increase the usable size of the array, you must increase ...
Using a NAS200 as a Print server
Last weekend I had a small weekend project to move my All-In-One Printer/Scanner from my Xen host server to a spare NAS200 I had lying around. Since the NAS200 has a i486 compatible CPU, and I had been able to run a CentOS 5 distro before, I figure it would make a good server with low power consumption. For that I updated my NASCC firmware so that it would boot a USB key, and update my CentOS image creation script. This worked well, I was able to boot CentOS without that much effort altogether. I myself have an Epson Stylus CX5500 which unfortunately only comes with binary drivers. This was not much of a problem since the NAS200 has a i486 compatible CPU. I find this is relatively unique among different NAS models. Alas, the performance was quite disappointing. I should be used to the NAS200 underperforming. But really, this was truly sad. I did not bother to test the printing, but I did try scanning with it. Running scanimage to scan a single page was taking over 15 minutes before I hit Ctrl+C. It was an idea, but the results were so sub par. The only take-aways of this are: ...
atratus project
The other day I came across this project. Looks an interesting idea. It is a project that lets you run unmodified Linux binaries on Windows. It is more similar to WINE than to for example coLinux. While I conceptually I understand how it would work at a low level, I am curious how it works with dynamically link executables. This is something I would like to test out when I have time. ...
Remote Bridging
Sometimes we need to connect two or more geographically distributed ethernet networks to one broadcast domain. There can be two different office networks of some company which uses smb protocol partially based on broadcast network messages. Another example of such situation is computer cafes: a couple of computer cafes can provide to users more convinient environment forr playing multiplayer computer games without dedicated servers. Both sample networks in this article need to have one *nix server for bridging. Our networks can be connected by any possible hardware that provides IP connection between them. Connecting Two Remote Local Networks With Transparent Bridging Technique Short description In described configuration we are connecting two remote LANs to make them appearing as one network with 192.168.1.0/24 address space (however physically, presense of bridges in network configuration is not affecting IP protocol and is fully transparent for it, so you can freely select any address space). Both of the bridging servers has two network interfaces: one (as eth0 in our example) connested to the LAN, and second (eth1) is being used as transport to connect networks. When ethernet tunnel between gateways in both networks will be bringed up we will connect tunnel interfaces with appropriate LAN interfaces with bridge interfaces. Schematically this configuration can be following: ...
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